Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ad9fb724c2f46ef…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:47 Authoring application: Microsoft Excel
MD5: db94c81ce747e08363197908f003d14e SHA-1: 864314c47e0463a732e57ce48b45db55649b4157 SHA-256: 6ad9fb724c2f46ef5c9399fd2472417e966430c9a654af0fb7441cfdc9ecd118
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload. No specific URLs or hashes were extracted, limiting further IOC identification.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
6ad6d9eace4b1b04e438d83026c13570a1253f023351d1bae37ddcbdc87eec7c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6557 bytes

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